Non-clinical factors impact on decisions about whether to refer a patient from primary care to specialist mental health services. The aim of this study was to investigate whether introducing a standardized assessment of severity improves agreement on referrals.Methods
Multi-site mixed-method cluster randomized controlled trial, investigating GP referrals from 73 practices (408 839 patients) to 11 community mental health teams (CMHTs). Intervention group GPs were asked to complete a Threshold Assessment Grid (TAG) rating of mental health problem severity. CMHTs rated referral appropriateness (ISRCTN86197914).Results
Two hundred and eighty-one GPs made 1061 mental health referrals. The intervention was only partly implemented with 25% of intervention group GPs completing TAGs. No difference was found in appropriateness (OR 1.18, 95% CI 0.91–1.53) or secondary outcomes. Post-referral primary care contact rates were higher for the intervention group (IRR 1.36, 95% CI 1.07–1.73). Qualitative data identified professional and organizational barriers to implementation.Conclusions
Asking GPs to complete a TAG when referring to CMHTs did not improve primary–secondary care agreement on referrals. Low implementation means that uncertainty remains about whether introducing a severity-focussed measure into the referral process is beneficial. Introducing local protocols to manage demand at this interface may not be successful and more attention needs to be paid to human and organizational factors in managing interfaces between services.